Lumber saw sharpener



Search Room May 17, 1938. R. HEINO 7,801

LUMBER SAW SHARPENER Filed Jan. 7, 1936 2 Sheets-Sheet l Invenlor Bydgwgis m 76. METAL TQQLS 6i IMPLEM NTS, MAKING Patented May 17, 1938UNITED STATES search Room PATENT OFFICE LUMBER SAW SHARPENER RudolphHeino, Mokomon, Ontario, Canada Application January 7, 1936, Serial No.57,995

3 Claims.

My invention relates generally to means for sharpening the teeth ofcircular lumber saws, and particularly to means of this character whichis brought into action without dismantling or stopping the saw and whilethe saw is rotating, whereby the saw may be sharpened as it is shiftedback and forth into action, and an important object of the invention isto provide mechanically efficient and durable means of this character.

Another very important object of the invention is to providesharpeningmeans of the character indicated above which can be broughtinto action simply by the manipulation of a lever during the shift ofthe saw from the work.

Other important objects of my invention will be apparent from a readingof the following description in connection with the drawings, whereinfor purposes of illustration I have shown a preferred embodiment of myinvention.

In the drawings:-

Figure 1 is a general side elevational view of the embodiment.

Figure 2 is a longitudinal vertical sectional view taken through thefile carrier and showing the same applied to the teeth of the lumbersaw.

Figure 3 is a top plan view of the file carrier.

Figure 4 is a longitudinal vertical sectional view taken through one ofthe file assemblies.

Figure 5 is a transverse vertical sectional view taken through Figure 4approximately on the line Figure 6 is a horizontal sectional view takenthrough Figure 4 showing the arrangement of one of the springtighteners.

Figure 7 is a transverse vertical sectional view taken through thesupport arm and a portion of the file carrier showing the file carrierbraking arrangement.

Figure 8 is a perspective view of one of the file blocks.

Referring in detail to the drawings, the numeral 5 refers, generally toa suitable standard which is mounted by means generally indicated by thenumeral 6 on a suitable support 1 adjacent the lumber saw, whichstandard has a rearwardly extending pivot bracket 8 to which is pivotedthe lower end of a manual operating lever 9 which has a dog operatingmember 19 which is operatively connected by a rod II to the dog l2 whichoperates in connection with the notched segment l3 mounted above thebracket 8 on the standard 5.

The upper end of the standard 5 has journals generally designated I4which receive an axle [5 which is held in place by nuts IS, the axlehaving pivoted thereon the lower end of the file carrier support arm I!which when in operative position is designed to rest against the stop 18on the upper end of the standard, as clearly shown in Figure 1. A pointof the support arm 11 above the axle I5 is pivotally connected by oneend of a lever I9 to an upper part of the lever 9 as indicated by thenumerals 20 and 2|, respectively, whereby swinging motion is applied tothe support arm I! by manipulation of the lever 9. In the left handposition in which the support arm I1 is shown in Figure 1, the device ofthe invention is in the operative position, whereas when the lever 9 isswung rear- Wardly or toward the right, the support arm I! will beholding the file carrier out of operative relation to the lumber saw.

The file carrier support arm I! comprises the straight part 22 which hasits upper end extended into a laterally and acutely angulated part 23which has a general horizontal position illustrated in Figure 1 while inoperative position. The left hand end of the portion 23 has a rearwardlyangulated portion 24. There are two of the portions 23, each having apart 24 (as shown in Figure 3) arranged on opposite sides of the filecarrier which is generally designated 25.

The inner sides of the upper ends of the parts 24 (shown in Figure 7)are provided with concave rounded recesses 26 which receivethecorrespondingly shaped brake members 21 which have a flat side appliedin braking relation to the outer sides of the file carrier side platesor disks 28.

Traversing the portions 24 and the brakes 21 is the threaded rod 29which has its threaded ends extending beyond the portions 24 andequipped with nuts 30 which can be turned so as to bear against theouter side of the members 24 and thereby force the brakes 21 withgreater pressure against the outer sides of the file assembly disks 28,and thereby increase the resistance of the file carrier to being turnedby the saw, so as to increase the filing effect of the files on theteeth of the lumber saw.

The file carrier generally designated 25 includes the circular sidedisks or plates 28 which have center openings threaded as indicated bythe numeral 3| and receiving the threaded ends of the journal 32 whichturns on the rod 29, and nuts '33 are provided on the threaded portions3| of the member 32 to bear against the inner sides of the disks,whereby the disks are rigidly as- At equal circumferentially spacedintervals the file carrier plates are traversed by axles 34 which havecotter pins 35 in the opposite ends thereof bearing against the outersides of the said disks. Adjacent each axle 34 and fastened between thedisks 28 are the spring holders 36 and 31 which have openings 42 thereinin which one end of the respective springs 38 and 39 are tethered. Eachspring holder (as shown in Figure 6) is provided at one end with a head40 which bears against the outer side of one of the disks 28 and at itsopposite end with a threaded portion equipped with a nut 4|, theloosening of which will enable the rotation of the spring holder to wrapa portion of the spring concerned around the tightener or unwind thesame therefrom, so as to tension or relax, respectively, thecorresponding spring. The holder may be locked in the new position bysimply tightening the nut 4|.

Rockable on the axle 34 is the corresponding one of the file assemblies43 which consists of a U-shaped body 44 having the acutely angulatedbight portion 45 on which is a threaded boss 45 in which is threaded atightening screw 41. The bight portion has L-shaped retaining flanges 48under which the corresponding file 49 is placed in the manner indicatedin Figure 5. The file is locked rigidly in place by tightening the screw4! against the back of the file. Each file assembly is equipped alsowith a spring tightener rod 50, similar to the spring holders 36 and 31,and equipped with a spring end receiving opening The axle 34 isrotatably received in openings 52 in the arms of the body remote fromthe bight portion. A spring and receiving opening 53 is provided in aportion of the bight as shown in Figure 4 for receiving one end of thespring 38, the spring 39 being engaged with the opening 5| of thetightener 50 in the case of each file assembly. The file assemblies arearranged relative to the file carrier and to the teeth 54 of the lumbersaw 55 in the positions clearlyshown in Figure 2, and circumferentiallyspaced so that as one tooth leaves a file assembly the next fileassembly will be pulled into the original position of the first engagedfile assembly, to act upon the succeeding tooth of the saw, whereby therotation of the saw 55 applies the edges of the teeth 54 to the files49. The file carrier 25 is rotatable in a counterclockwise direction asshown in Figures 1 and 2. The springs 38 and 39 are so arranged that thefile assembly is yieldably held in a position to be engaged by a sawtooth as the device is applied to the saw for the sharpening of theteeth thereof. As the tooth of the saw engages the file 49, the springspermit the file to be moved by the tooth into a position parallel to andalong the edge of the tooth. The engagement of the saw tooth with thefile not only produces this displacement of the file assembly, butcauses the tooth edge and the file to move in opposite directions whileengaged, whereby the filing action is accomplished and the tooth edgesharpened. As soon as the tooth has moved to a point in its clockwiserotation where it is about to leave the file assembly, the saw toothpushes the file assembly over in a manner to cause additionaldisplacement thereof and at the same time turn the file carrier in thecounterclockwise direction to bring the succeeding file assembly intothe path of the next succeeding tooth of the saw. It is to be noted thatas soon as the tooth reaches a position in which it clears the fileassembly engaged, the springs of the file assembly will return the fileassembly to initial position. It is believed obvious that the files 48are so angulated in their original or initial position of the fileassemblies that the springs positioning the file assemblies are enabledto cause the face of the files to follow the contour of the saw toothedges in a manner to effectively file and sharpen these edges, wherebythe files are dragged along the cutting edges of the teeth and thesharpening thereof accomplished while the file assembly is in operativerelation to thesaw and while the saw is rotating. By means of thearrangements described the teeth of the lumber saw may be sharpened veryquickly and accurately and efilciently.

Although I have shown and described herein a preferred embodiment of myinvention, it is to be definitely understood that I do not desire tolimit the application of the invention thereto, and any change orchanges may be made in the materials, and in the structure andarrangement of the parts, within the spirit of the invention and thescope of the subjoined claims.

What is claimed is:-

1. A device for sharpening the teeth of a rotary lumber saw while saidsaw is rotating and comprising 'a standard, a pivoted support carriedthereby, a carrier rotatably mounted on said pivoted support, sawsharpening elements pivotally mounted on the carrier and meanscooperating with said elements for yieldably maintaining the same inposition for contact by the teeth of the saw.

2. A device for sharpening the teeth of a rotary lumber saw while saidsaw is rotating and comprising a standard, a pivoted support carriedthereby, a carrier rotatably mounted on said pivoted support, a filepivotally mounted on the carrier and means engaging the carrier foryieldably urging the file into sharpening relation with the edges of theteeth of the saw by the engagement of the teeth therewith while the sawis rotating.

3. A device for sharpening the teeth of a rotary lumber saw while saidsaw is rotating, said device comprising a standard, a pivoted supportcarried thereby, a file carrier rotatably journaled on the support, aplurality of file assemblies pivotally mounted by the carrier and springmeans yieldably maintaining the assemblies in the path of the teeth ofthe saw for contact thereby during the rotation of the latter.

RUDOLPH HEINO.

